Question 9 Given a sample of size 25 and an unknown standard deviation, which of the following values should be used as the first part of the margin of error when computing a 95% confidence interval estimate for the population meam A 1645 82064 OCIM 6.1.711

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A: Here, σ=10, E=3, and CL=0.95. Note that the value of zα2 for 95% confidence level is 1.96.

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A: Formula : Z =(X - μ)/σ

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A: Empirical rules:1) P(μ-σ<X<μ+σ)=68%2) P(μ-2σ<X<μ+2σ)=95%3) P(μ-3σ<X<μ+3σ)=99.7%

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A: "Since you have asked multiple questions, we will solve the first question for you. If you want any…